Zickgraf, F., Thiering, I., Krautter, J., Appenzeller, I., Kneer, R., Pakull, M. W., & Heidt, J. (1997). Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources: II. the optical observations. Astronomy & astrophysics. Supplement series, 123(1), .
Chicago-Zitierstil (17. Ausg.)Zickgraf, Franz-Josef, Ingeborg Thiering, Joachim Krautter, Immo Appenzeller, Reinhold Kneer, Manfred W. Pakull, und Jochen Heidt. "Identification of a Complete Sample of Northern ROSAT All-Sky Survey X-ray Sources: II. the Optical Observations." Astronomy & Astrophysics. Supplement Series 123, no. 1 (1997).
MLA-Zitierstil (9. Ausg.)Zickgraf, Franz-Josef, et al. "Identification of a Complete Sample of Northern ROSAT All-Sky Survey X-ray Sources: II. the Optical Observations." Astronomy & Astrophysics. Supplement Series, vol. 123, no. 1, 1997.